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A. E. MICHAELSON.

PHOTOGRAPHIC MOTION RECORDING DEVICE.

APPLICATION man NOV. 13, 1917.

1,303,099. Patented May 6, 1919;

Jf/arzzey.

UNITED STATES PATENT OFFICE.

ANDREW E. MICHAELSON, OF PORTLAND, OREGON.

FHOTOG-RAIPHIC MOTION-RECORDING DEVICE.

To all whom itmay concern:

Be it known that I, ANDREW E. MICHAEL- SON, a citizen of the UnitedStates, and a resident of the city of Portland, county of Multnomah,State of Oregon, have invented a certain new and useful Improvement inPhotographic Motion-Recordin Devices, of which the following is a specication.

The object of my invention, briefly stated, may be said to consist inproviding means for obtaining a permanent record, in a s1 mple way, ofthe number of cycles of motion a moving body-the number of completerevolutions a revolving bodymakes during a given time. My invention waspartlcularly designed for registering the travel of a vehicle, although,as will be evident, 1t may be used to advantage for many other purposes.

It will suffice for me to describe how I attain my object for thepurpose of recording the revolutions of a revolving body, as, forexample, recording the travel of the wheel of the vehicle during agiventime. For such purpose my device comprises a recording wheel, givenrelative rotation with respect to the vehicle wheel; the rim of therecording wheel is provided with an orifice through which a beam oflight from a suitable artifical source is projected and a sensitizedtape, preferably graduated with respect to time, is caused-to travel atconstant speed in front of said orifice, so as to have impinged uponitself said beam of light.

After my device has been working for a time, and it is desired to obtainthe record which it has made, the tape is removed and developed, bywhich a permanent record will be produced of the number of flashes oflight which were projected on the tape in the given time; and suchrecord, of course, will serve to record whether the vehicle moved at allwithin any, or a certain, period of time, as well as the speed at whichit traveled while in motion during divisions of the same period.

It will suflice to describe my means by the aid of diagrammatic figures,such as shown in the accompanying drawings, in which:

Figure 1 represents, diagrammatically, all the elements comprised withinmy recorder; and

Fig. 2 illustrates a section of the sensitized tape provided withgraduations representing time, and assumed to have been ex-Specification of Letters Patent.

Patented May 6, 1919.

Application filed November 13,1917. Serial No. 205,479.

posed vin my recorder as hereinafter explained.

a represents a light-proof case. b, b are r'evoluble spools. Asensitized tape 0 is fastened at one end to the spool I), being thenceconducted over a guide roller (Z to and over a driven pulley by whichthe tape is given its motion; and it is finally wound on the spool Z).The driven pulley e is rotated by a clockwork assumed to be contained inthe case f and to be adapted to move the tape 0 at constant speed whenthe clockwork is set into motion. There is a driving connection 9between the clock-driven spool e, and the spool 79 is assumed to bedriven at such speed as to wind up the out-going end of the tape 0 incooperation with the motion imparted to the tape by the clock-drivenspool e. The details of communicating motion between the spools e and bbein immaterial, I have merely diagrammatically represented such meansas including a cord (g) permitted some slip with regard to itsconnection with the spool b and adapted to revolve the latter at properspeed so as to wind up the tape end as it passes the spool.

The wheel 72. is fast on a shaft i which is assumed to have properconnection with the vehicle wheel so as to impart to it relativerotation, as obvious, by recording the number of complete revolutions ofthe wheel h within a given period of time, the fact whether the vehicledid travel, and also the speed at which it traveled during such time isrecorded. In order to obtain such record, I provide the rim of the wheelh with an orifice 7', through which to pass a beam of light from thelamp is, which is assumed to be an electric lamp connected with theproper source of energy, through the tenninal wires Z and theirconnections. m represents a screen which is assumed to inclosesubstantially 1ight-pro0f the rim of the wheel h, and has an orifice mthrough which the beam of light is permitted to impinge upon the tape 0.The latter has a photographically sensitized surface, and is providedwith graduations, as, for example, a, 4%, representing half-hours andhours.

In the diagrammatic view, Fig. 2, the disks 0 represent spots producedon the sensitized surface of the tape by the beams of light projectedthrough the orifices j, m in the course of the tapes travel duringsuccessive periods of time.

When my recorder has operated for such length of time as to have unwoundthe tape 0 from the spool b, and Wound the same on the spool b, whichfact may be observed through an observation orifice covered by coloredglass located as'at p, the spools'may be taken out and a new spool oftape inserted, in similar manner as in a photographic camera; and thetape is then to be developed, and will produce the record desired. V 7

Instead of using a tape graduated With respect to time, an ungraduatedtape may be used, and the device for movingthe sameadapted to cause itstravel a certain distance Within a given time, as, for instance,

an inch per hour, whereupon an ordinary foot-rule'could later 'be used:for ascertaining the travel of the moving body, and its speed 1 ,eospoeduring a certain interval. The graduations on the tape are merelysuggested for convenlence.

I claim:

An apparatus of the character specified comprising a substantiallylight-proof case, an annular member, rotatable therein, havinga lightpassing orifice in its rimcand being driven relatively to the body ofwhich the travel is to be recorded, a source of light Within the annularmember. and adapted to project beamv through said: orifice, spools inthecase winding; and unwinding a sensitized tape, andi clock Worksadapted for moving thetape, at: a certain rate during, intervals o-fitime; said tape moving in front of said orifice of said: annular member,

' ANDREW E. MICHAELSON;

Copies of this patent may be obtained for five. cents eachbyiadglressingp theflflommissionerot Iatents,

Washington, D..G.

